I'm not gay but I have a crush on another girl, what should I do?

First...to make everything clear, I have always seen myself as straight. Maybe the fact that I'm 16 and raging with hormones is a contributor, but nevertheless it doesn't make it any less confusing. For the past year and a half I have had an excrutiatingly hard crush on one of the girls who goes to my high school. She is such a great person to be around and I can always talk to her. I can keep my composure pretty good around her but sometimes it suprises me that she doesn't notice me GAWKING at her. She has made it known to me that she is bisexual. (Yay for me right!?) But I can't bring myself to tell her how I feel. The funny thing is that this is so unlike my usual personality. I have always been able to say what I need to say. (For the record she is usually the shy one) Anyway...I'm afraid of telling her how I feel and possibly starting a relationship because I don't want her to get hurt if this turns out to be only a phase. I'm also worried about what everyone will think... (does that make me a bad person?).... I find myself thinking...no FANTASIZING about her! Its driving me crazy! I feel like if I kiss her just once I could move on and get her out of my system, but its more complicated than that.